Remove updateEntryEditorIfShowing

[koppor]

The method updateEntryEditorIfShowing seems to be a left-over of old times.

It was called very rarely.

Since the argument for showAndEdit was the currently entry, the only action the thing did was to focus the entry editor. The callers were "Cleanup" and "SpecialFieldAction". I don't think, they need an entry editor focus.

Mandatory checks

• I own the copyright of the code submitted and I licence it under the MIT license
• Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

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[calixtus]

Changelog needed?

[koppor]

Changelog needed?

I don't think so. Would be too cryptic IMHO.